Method of making manganese steel



net as,

RICHIWB D. JORDAN AND JOHN H. HALL, OF HlGH BRIDGE, NEVJ JEEtfsiEY, AS$I-"F'3'G TU TAYLOR-WILTON IRON AND STEEL COJPIEPAIQ'Y, 0F

BRIDGE,

JERSEY, A GDIRPORATION OF NEW JERSEY.

BEEIHOD OF MAKING MANGANESE STEEL.

Etc Drawing. Applicati'tin filed June 5,

1 '0 (ZZZ whom may, concern:

Be it known that W87 RICHARD 1'). JORDAN and JOHN H. HALL, citizens of the United States, residing at High Bridge. in the county of Huntcrdon and State of New Jersay, have invented certain new and useful Improvements .in Methods of i'iilaking Manganese Steel, of "which the following is a specification.

This invention relates to the production of commercial manganese steel in the electric furnace.

Hcretotore and before. our invention, the accepted practice has been to melt a charge of low phosphorous carbon scrap together with a small quantity oi lime in tlYG BlBCtFlC furnace under oxidizing conditions for the purpose and with the resultot reducing the carbon in the metal While the scrap is melt ing. Ii here is too much carbon it is reduced to the proper proportions by the addition of iron ore or mill scale. After the :arloon has been propcrl adjusted the slag which is :tormcd during the melting opera tion by a combination of the lime with the oxides of iron. silicon and manganese, is Worked with a dcoxidizingz agent until the characteristic carbide slag is obtained. The proper term-manganese additioi'i'is then made, the heat brought to toe proper temperature and then tapped. This method was desirably prolonged. it being the gen eral opinion that the greater the time interval of treatment. the higher the qualit of the steel.

lVe depart from this practice in several respects. will hereinafter more fully appear, with the result that We obtain a supcr or product in a Fractional part ot the time heretofore required.

Broadlyfour invention consists in malting; new manganese stccl fr m carbon scrap csscntialh low in carbon and preferably trom low carbon low pho phorous carbon steel scrap. or the same in conjunction with manganese steel scrap. the salient feature being the addition, at the outset and bc't'orc melting. while exercising due precaution against the hazard of oxidatioz'i. oi. in he one case. tcrromaugaucse quantitatively suiiicieut to produce with the carbon scrap 1922. serial no. 586,141.

a finished manganese steel, and of, in the other case sufficient iierromanganese to con rcct the deficiency in manganese of the mam ganese steel scrap.

In our method of making manganese steel in the elec ric furnace, We charge low carbon low phosphorous carbon steel scrap as distinguished from ordinary steel scrap, with the necessary amount of ferro manganose to make a finished manganese steel. a small amount of a lime and silica sand mix ture, and melt the charge under non-oxidizing conditions. The lime and sand. under the influence of heat, combine and rapidly form aslag that protects the metal from oxidation. After the bath is melted we bring the heat as rapidly as possible to the required temperature and ,tap from t e furnace. working the slag with a deoi-zidizing agent from the time the scrap is melted until the heat is tapped. Any final adjustments of carbon. manganese. and silicon that may be necessary are made just before the heat is tapped.

lVe have determined that manganese steel made in the electric furnace is of inferior quality when the silicon is below We have discovered that a high quality steel results when the silicon maintained above and preferably above .50. It the silicon in the bath is below the desired limit, We increase it by the addition oi"? ferr silicon or. it the silicon and manganese are both low. We use low carbon silico-manganese, or a combination of the two. or combination of siiico-mangaucse and terro'manganese.

We do not limit ourselves to a charge of low carbon scrap alone. as our method may be employed with equal facility with a mixture of carbon scrap and manganese scrap, In this case we will proceed exactly as be fore with the exception that a smaller amount of terro-manganese will be added to the scrap.

Having described our claim z-- 1. The method of making manganese steel in the electric furnace, which consists in establishing a charge including the necinrention, We

too

cssary make-up of ferr c-manganese and an ihe resultant steel xiii have a silicon content of 150 p01 can? or m, we.

H. That nnprovmnentin the production of nmnganese steel in fhe electric furnace, which consists in introducing into the fur nace, before the application of heat to the (hli'gfl and, while providing for substantially non-carbonizing and non-oxidizing conditions, substantially that proportion of fevrro-manganese required to produce o0mmercial manganese steel.

In testimony whereof W8 aifix our Sign! tures.

mcnnnn D. JORDAN. JOHN H. HALL. 

